Element.setAttribute()
Set an attribute (including data attributes) on an element.
let elem = document.querySelector('#lunch');
elem.setAttribute('data-sandwich', 'turkey');
⏰ Preorder my new course on Web Components! Want to learn how to build Web Components from scratch, master best practices, and more? Preorder today and get $100 off of the launch price.
Find this useful? You can support my work by purchasing an annual membership.